My daystatate is rated for a SWP 230 bars.can a 230 bar scuba tank top this PCP up or shud i go in for a higher capacilty tank.Can a steel 6 litre 300 bar tank actually achieve a 300 bar working pressure

It's best to fill your Daystate to around 200 BAR, in general the bigger the tank and the higher the rating the better to save on journeys to have it recharged. However, a 300 BAR tank it's absolutely necessary. Always fill the rifle slowly to your fill pressure. Tank must be filled with dry air as supplied for Scuba diving.

Manton thanks for the input.I still use the hills mk 3 pump but was thinking of switching to a scuba tank.What im being offered is a steel tk 300 bar rating 6 litres used type with a hydro static test certificate.But have to look for a compressor air supplier where i am located to ensure regular air supply/refills.The Hills is ok but at abt 220 bars plus one can feel the dam strain building up for a downward pump.i can comforatbly rebuild the Hills but even then wonder why does it start straining at abt 220 bars.Anyway this time i experiment with a 200 bars top up only which is easy on the hills .Ironically and ABOVE ALL ,hunting is BANNED in my country INDIA since 1971

The 300 BAR tank fitted with the correct valve would be fine provided that you don't have to travel too far for a fill. I suggest you try filling to less than 230 BAR, for shooting tests use of a Chronoscope to record velocities is of benefit. The little Combro is excelent for that purpose and can be connected to a computer to plot the velocity curve.http://www.chronoscopes.com